,Extjs 分页不准确

求助,Extjs 分页不准确

JScript code

       //创建数据存储对象    var createStore = function( store,treeId){        var ds=new Ext.data.Store({                 proxy:createProxy(treeId),                reader:new Ext.data.JsonReader({                    totalProperty:'totalProperty',                    root:'root'},                    store),                paramNames:{                    start : "start",                    limit : "limit",                    sort : "sort"                }            });         return ds;    }        //创建表格底部工具条    var createBBar = function(tempStore,bbarItems){        var bbar = new Ext.PagingToolbar({             pageSize:18,             store: tempStore,             displayInfo:true,             items:bbarItems,            displayMsg:'显示第{0}条到{1}条记录,一共{2}条',             emptyMsg:"没有记录"         })        addClickEventBybbar(bbar);        return bbar;    }